import turtle

t = turtle.Turtle()
t.speed(1)

t.penup()
t.goto(-50, -50)
t.pendown()
t.pencolor("blue")
for _ in range(4):
    t.forward(100)
    t.left(90)

t.penup()
t.goto(0, -50)
t.pendown()
t.pencolor("red")
t.fillcolor("yellow")
t.begin_fill()
t.circle(50)
t.end_fill()

turtle.done()